Automatic train-stop.



J. V. DAWSON.

AUTOMATIC TRAIN STOP.

APPLICATION man MAR. 30. 1914.

Patented Mar. '21, 1916.

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UNTTED STATES PATENT @FFIQE.

JAMES V. DAWSON, OF DELTA, IOWA.

AUTOMATIC TRAIN-STOP.

Application filed March 30, 1914.

To all whom it may, concern Be it known that l, J earns V. DAWSON, a itizen of the United States, residing at Delta, in the county of Keokuk and State of Iowa, have invented certain new and useful Improvements in Automatic Train-Stops; and I do h reby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an automatic train stop and the primary object of the invention is the provision of a mechanism carried by the engine of the train, which upon actuation by a trip arranged along side the track upon which the train travels, will synchronously apply the air brakes, cut out the steam supply and sound an alarm, by blowing the whistle of the engine.

Another object of this invention is the pro vision of means for automatically positioning the train arresting mechanism for reactuation by the trip, immediately after it has been operated for stopping the train.

\Vith the foregoing and other objects in view this invention consists in such novel features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings and claimed.

In describing the invention in detail reference will be had to the accompanying drawings wherein like characters of reference designate like or corresponding parts throughout the several views, and in which Figure 1 is a view in elevation showing the improved train arresting mechanism applied to an engine. Fig. 2 is a detail elevation of a part of the mechanism for synchronously applying the brake, cutting off the steam supply and blowing the whistle of the engine. Fig. 3 is a detail sectional view through a lever which engages the trip mechanism arranged along side the track, and Fig. 4 is a detail view of the trip mechanism which is arranged along side the track upon which. the train travels.

Referring more particularly to the drawings, 1 designates an engine such as is employed for the propulsion of railway trains, which engine has pivotally connected to the exterior of the boiler 2 thereof, adjacent the forward end of the same, a lever 5, which lever extends vertically above and below the Specification of Letters Patent.

Patented Mar. 21, 1916.

Serial No. $28,393.

pivotal point 6 thereof, having a pawl 7 pivotally mounted within the recessed end 8 thereof. The recess 9 which is formed in the lower terminal end of the lever 5, terminates with the lower end of the lever and has the rear shoulder 10 formed upon the lever 5, by the rear termination of the cut out portion 9, arcuate as is clearly shown in Fig. 2 of the drawings.

The pawl 7, which is pivotally mounted within the recess 9 formed in the lower terminal end of the lever 5, has its edge 11, which faces the direction of travel of the train convex, and its rear edge is concaved. The convex face 11 is provided for engagement with a convex surface of a trip 12, which is arranged along side the track upon which the train travels, and positioned so that the pawl will engage the same, as will be hereinafter more fully described.

The lever 5 has a rod 14 pivotally connected at 15, near its upper terminal end, which rod extends longitudinally along the outer surface of the engine boiler 2, being slidably supported by a bracket 16, which bracket is carried by the engine structure, and the rod extends into the cab 17, of the engine, being pivotally connected to the throttle lever 18 at its terminal end.

A collar 9 is rigidly mounted upon the rod 14, and it is connected to the air brake applying lever, (not shown) by a rod or link 20. The collar 19 is also connected to the actuating lever 21 of the whistle 22 which is carried by the engine, by a cord 23. A coil spring 25 is coiled about the rod 14, and has one end thereof securely connected to the bracket 16, while the other end of the coil spring is connected to the collar 26, which collar is rigidly mounted upon the rod 14.

Coil springs 27 and 28 are connected to the lever 5 below the pivotal point 6 thereof, and are also connected to the engine body 1, providing means for steadying the mo ement of the lever 5, and also for facilitating the returning of the lever 5 and the rod 14 to their normal positions, immediately after they have been actuated through the medium of contact between the pawl 7 and the trip member 12 which is arranged along side the track.

In the operation of the improved automatic train stop as heretofore described, a trip mechanism 12 of any suitable construc tion, may be positioned along side the track upon which the train travels, so that upon the approaching of a train, the pawl 7 will engage the trip member 12, and upon passage over the concaved surface thereof, the pawl 7 will be moved upon its pivotal point and forced inwardly into the recess 9, until the upper portion of its convex edge engages the arcuate shoulder 10, and the lever 5 will then be moved upon its pivotal point upon further movement of the train, causing the upper terminal end 29 of the lever to which the rod 14 is connected, to move in the direction indicated by the arrow A in Fig. l of the drawings, which will slide the rod 14 within the bearing 16, compressing the spring 25, and synchronously operating the throttle lever, the air brake applying lever and the actuating lever 21 of the whistle 22, arresting the motion of the train and blowing the whistle to acquaint the trainmen that a certain signal has been passed.

Immediately after the pawl 7 has passed over the trip member 12, the spring 25, and the springs 27 and 28 will automatically force the rod 14 and the lever 5 into their normal positions preparatory to being actuated by the trip member 12.

From the foregoing description taken in connection with the accompanying drawings the advantages of the construction and of the method of operation of the improved automatic train stop will be readily apparent to those skilled in the art to which this invention appertains and, while in the foregoing description, the principle of the operation of this invention has been described together with various features of construction, it is to be understood that certain minor features of construction, combination and arrangement of parts may be altered to suit practical conditions provided such alterations are comprehended within the scope of what is claimed.

What I claim is:-

1. The combination with an engine having a boiler, of a vertical lever pivotally secured intermediate its ends to one side of the boiler near its forward end thereof, a bearing bracket secured to said boiler intermediate the cab and the pivotal point of the lever, an operating rod slidably mounted through said bearing bracket and extending into said cab and connected to the throttle rod, its opposite end pivotally connected to the upper end of the lever, a collar rigidly secured to said rod and disposed between the bracket and the lever, a coil spring mounted around said rod one end secured to the collar, its opposite end secured to the bracket and adapted to hold and move the lever back into its normal position.

2. The combination with an engine having a boiler, of a vertical lever pivoted intermediate its ends to one side of the boiler adjacent its forward end, a bracket secured to said boiler intermediate the cab and the pivotal point of the lever, an operating rod slidably mounted through said bracket, one end extending into the cab and connected to the throttle rod, its opposite end pivotally connected to the upper end of the lever, a collar rigidly secured to said rod and disposed between the bracket and the lever, a coil spring secured around said rod, one end secured to the collar, its opposite end engaging the bracket to hold the lever in a vertical position, the lower end of said lever being bifurcated, a curved pawl centrally secured between the bifurcated portion of the lever, a spring means secured on opposite sides of said lever and to the boiler adapted to provide means whereby the pawl can engage an object placed in its path, and will move the. lever rearwardly and the rod forwardly, thereby closing the throttle.

In testimony whereof I afiix my signature in presence of two witnesses.

J AMES V. DAWSON. Witnesses:

H. L. MITCHELL, W. F. MOODY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, I). C. 

